Evaluation of the dual-feed rotor spinning unit based on airflow dynamics and blended yarn properties

Akankwasa, Nicholus Tayari; Lin, Hai; Wang, Jun

doi:10.1080/00405000.2017.1305866

Cited by 17 publications

(12 citation statements)

References 21 publications

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“…Accordingly, we choose the rigid infinitesimal segment as the single-fiber model. Assume that the fiber is composed of a series of rigid segments that have fixed length and quality [8]; then…”

Section: Single-fiber Modelmentioning

confidence: 99%

“…Current research on the spinning mechanism of compact siro spun technology, compact siro spun yarn structure, and the relationship between spinning process and yarn quality is not enough for optimizing the compact system and for improving compact technology. Liu et al [7] studied the effects of lattice apron density on the yarn quality in a four-line compact spinning system by analyzing the numerical simulations of the airflow velocity; Akankwasa et al [8] evaluated the dual-feed rotor spinning unit based on airflow dynamics and blended yarn properties; Jungbecker et al [9] developed a kinematic model for yarn movement in turbulent airflows. These provide new research ideas and methods for the study of compact siro spun yarn.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of the Condensing Effect of Different Suction Slots on Fiber Strands in a Compact Siro Spinning Machine with Lattice Apron

Han

Gao

Chen³

2020

Autex Research Journal

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Compact-siro spun with lattice apron combines compact spinning and siro spinning, and is widely put into practice. In this paper, compact-siro spun models with the parallel shaped slots, oblique parallel shaped slots and V-shaped slots were simulated. Based on the airflow data in the condensing zone, the geometrical model of single fiber is built, and then the trajectory of single fiber can be got. The morphological changes and movement process of fiber strands in the flow field of condensing zone were verified by the comparison experiments of yarn morphology, hairiness, tensile and evenness properties. The results showed that the V-shaped slot achieved the optimal agglomeration effect and yarn performance. The theory analysis gives foundation and explanation for the experiment, and also provides a theoretical basis for optimizing the properties of compact-siro yarn in production practice.

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Section: Single-fiber Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Condensing Effect of Different Suction Slots on Fiber Strands in a Compact Siro Spinning Machine with Lattice Apron

Han

Gao

Chen³

2020

Autex Research Journal

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“…Seyed et al 15 and Lin et al 16 carried on the spinning test to compare the yarn quality and hence verified the effect of the optimized transfer channel airflow field on the yarn properties. Akankwasa et al 17 also evaluated the blended yarn quality to support the simulated results of the airflow characteristics in conventional and dual-feed rotor spinning machines. There are many simulation works on the airflow in the rotor spinning machine and some experimental methods to figure out and verify the effect of the airflow on fibers and yarns.…”

mentioning

confidence: 98%

Characterization of the airflow field in the rotor spinning unit based on a novel experimental approach and numerical simulation

Shi

Akankwasa

Zhang

et al. 2020

Textile Research Journal

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It is very challenging to experimentally characterize and verify the airflow in the rotor spinning machine because the process takes place in an enclosure. In an attempt to portray the process, we present a methodology that combines a novel experimental approach and numerical techniques. We developed a model unit and used colored smoke to mimic the airflow behavior practically, measured the air pressure, and compared the results to the simulation data. Three state conditions, namely suction and rotation (the regular rotor spinning operation, (Case 1)), without rotation (Case 2), and without suction (Case 3), were adopted to investigate the formation mechanism of the airflow field in the rotor spinning unit based on two operating conditions. Results show that, in a regular state, the airstream accelerates rapidly in the transfer channel under the dominant action of air suction at the rotor outlet and crashes clockwise to the rotor wall with the joint action of two operating conditions. In the rotor, the airflow flows clockwise with the velocity distribution of a multi-ring gradient due to the dominant action of high-speed rotor rotation. Analytics from the air pressure indicate that while the air pressure in the rotor is mainly controlled by the action of the air suction mechanism, it is also affected by the superposition action of the rotation mechanism. This approach is groundbreaking for rotor spinning machine optimization and is anticipated to trigger more insights that will lead to fundamental research in the spinning industry and beyond.

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“…10,21 Numerous researchers have used the CFD method to model other spinning systems, such as rotor spinning. [22][23][24] Some studies on CCS have employed the CFD approach, such as the principle of condensing fiber in a bunch in CCS with a perforated drum, and the characterization of the three-dimensional (3D) flow field in lattice-apron type CCS was investigated. 10 Liu and Liu 10 studied the 3D flow field in four different types of pneumatic CCS systems (CCS with a perforated drum, CCS with a groovy drum, three-line roller CCS, and four-line roller compact spinning (FRCS)).…”

mentioning

confidence: 99%

Three-dimensional simulation and experimental investigation of three-dimensional printed guiding devices on lattice-apron compact spinning

Saty

Akankwasa

Wang

2020

Textile Research Journal

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The compact spinning system with a lattice apron utilizes air-flow dynamics to condense fibers in a bunch and enhance the yarn properties. One of the main challenges with this method is the lack of a comprehensive understanding of the air-flow field's effect in the condensing zone. This work presents a numerical and experimental investigation of the effects of three-dimensional (3D) printed guiding devices on the air-flow characteristics and yarn properties. Firstly, the 3D numerical model of the compact spinning system was set up based on the compact spinning machine geometrical dimensions. Secondly, different 3D prototypes were developed, simulated, and analyzed using computational fluid dynamics based on ANSYS software. The prototypes (A-type, B-type, and C-type), selected according to the simulation results, were then 3D printed to enable further experimental investigation. Air-flow analysis results in the air-suction flume area exhibiting a very high negative pressure, and the centerline zone was characterized by high velocity. Experimental results revealed that the three yarns spun with guiding devices had better strength, hairiness, and evenness than those spun without a guiding device. The model developed can be further improved and utilized for commercial purposes and is anticipated to improve compact spun yarn properties significantly.

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Evaluation of the dual-feed rotor spinning unit based on airflow dynamics and blended yarn properties

Cited by 17 publications

References 21 publications

Numerical Simulation of the Condensing Effect of Different Suction Slots on Fiber Strands in a Compact Siro Spinning Machine with Lattice Apron

Numerical Simulation of the Condensing Effect of Different Suction Slots on Fiber Strands in a Compact Siro Spinning Machine with Lattice Apron

Characterization of the airflow field in the rotor spinning unit based on a novel experimental approach and numerical simulation

Three-dimensional simulation and experimental investigation of three-dimensional printed guiding devices on lattice-apron compact spinning

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